Additionally:
3/
I ask because when I use X509Chain class from .NET on the same list of CA certs and intermidiate certs I receive correct chain (if I remove found chain certs, I receive one more valid chain) that validates my CRT but with SecureBlackBox I also receive one more CA (so this is also chain) that verifies my CRT.
Furtermore when I add some certs that are not validating my CRT but also can occur on production, the validation method returns "Invalid" status and I expect that validation process should omit this cert if it is not issuer of CRT and search proper chain which is present on mentioned CA list.
Here is the reason that method returns:

Technical Support is provided to customers with the linked Support Access Ticket. You will find your Support Access Ticket together with all the details about how to use it in the registration e-mail that we’ve sent to you upon the purchase. The procedure of linking the Support Access Ticket is described in the registration e-mail as well.

I am afraid that without the Support Access Ticket linked we won't be able to assist you. Thank you for understanding.

May I please ask you to create a support ticket in our Helpdesk system and provide some details of the license you have there (such as your license key, the licensee name or an e-mail address that was used to purchase the license - simply anything that might help to establish your licensing circumstances)?

Please do not post this information here - this is a public forum and you don't want your private details to be available for third parties.

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